Articles | Volume 19, issue 2
https://doi.org/10.5194/amt-19-549-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/amt-19-549-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Jan 2026
Research article |
| 22 Jan 2026
| 22 Jan 2026
Forward modeling of spaceborne radar observations
Cooperative Institute for Satellite Earth System Studies (CISESS)/Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, Maryland 20741, USA
NASA Global Modeling and Assimilation Office (GMAO), Greenbelt, Maryland 20771, USA
Satya Kalluri
Office of Low Earth Orbit Observations, NOAA, Greenbelt, Maryland 20771, USA
Yanqiu Zhu
NASA Global Modeling and Assimilation Office (GMAO), Greenbelt, Maryland 20771, USA
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EGUsphere, https://doi.org/10.5194/egusphere-2026-4086, https://doi.org/10.5194/egusphere-2026-4086, 2026
This preprint is open for discussion and under review for Geoscientific Model Development (GMD).
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This study presents a new capability for assimilating spaceborne radar observations into NASA's Goddard Earth Observing System (GEOS) using the JEDI data assimilation framework. The implementation includes a radar forward operator and associated assimilation components, demonstrated with GPM Dual-frequency Precipitation Radar (DPR) observations. Results show improved analyses of precipitation, hydrometeors, and atmospheric state variables, supporting enhanced weather forecasts and reanalyses.
Cheng-Zhi Zou, Xianjun Hao, John Qu, and Satya Kalluri
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Using satellite-derived lower-tropospheric temperature records from 1981–2025, we show that global warming has accelerated significantly since 2015. After removing ENSO and aerosol effects, warming trends reach 0.482 °C decade⁻¹, about four times larger than before 2015. Acceleration rates reach 0.48 °C decade⁻² near 2024, indicating that recent temperature spikes are part of an ongoing acceleration. If sustained, an additional 0.5–1.0 °C of warming could occur within the next decade.
Isaac Moradi, Ricardo Todling, Yanqiu Zhu, Benjamin Ruston, Benjamin Johnson, Yannick Tremolet, Dorukhan Ardag, Wei Gu, and Steven Pawson
EGUsphere, https://doi.org/10.5194/egusphere-2026-4086, https://doi.org/10.5194/egusphere-2026-4086, 2026
This preprint is open for discussion and under review for Geoscientific Model Development (GMD).
Short summary
Short summary
This study presents a new capability for assimilating spaceborne radar observations into NASA's Goddard Earth Observing System (GEOS) using the JEDI data assimilation framework. The implementation includes a radar forward operator and associated assimilation components, demonstrated with GPM Dual-frequency Precipitation Radar (DPR) observations. Results show improved analyses of precipitation, hydrometeors, and atmospheric state variables, supporting enhanced weather forecasts and reanalyses.
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Short summary
We evaluate the new radar module of the Community Radiative Transfer Model using radar observations from multiple frequencies. Simulated reflectivities show strong sensitivity to particle size distributions and frozen hydrometeor habits. Results highlight the role of microphysical assumptions in radar forward modeling and their importance for assimilating spaceborne radar data in weather prediction models.
We evaluate the new radar module of the Community Radiative Transfer Model using radar...
